The full-size SUVs from Chevy debuted a brand-new generation in the 2021 model year. The fifth generation of the Tahoe and the twelfth generation of the Suburban were unveiled in the 2021 Chevy Suburban. Crucially, the 3.0L I6 LM2 turbodiesel Duramax engine was added to the roster by both full-size SUVs; however, the new diesel engine was not available with the off-road-focused Z71 model level under either brand. Thankfully, that will soon change with the upcoming model refresh scheduled for the 2025 model year. GM Authority is now outlining the modifications that will enable the new Tahoe Z71 diesel and Suburban Z71 diesel to become a reality.
For those readers who may not recall, the reason why GM did not initially provide a Tahoe Z71 diesel and Suburban Z71 diesel was down to packing. The intercooler and related piping for the LM2 engine did not fit inside the high-clearance bumper of the Z71, according to a series of GM Authority interviews with Chevy’s technical team. As a result, the diesel engine was not offered for the Z71 trim level on any of the full-sizers.
That is now, however, about to change as a new Tahoe Z71 diesel and Suburban Z71 diesel will be available with the next 2025 model year facelift. Furthermore, the 3.0L I6 LZ0 turbodiesel Duramax will replace the departing LM2 diesel engine, providing better power and refinement. The diesel engine itself will also be new.
In response to a question concerning the launch of the new Tahoe Z71 diesel and Suburban Z71 diesel models in tandem with the 2025 model year, Todd Brown—Chevrolet’s full-size SUV advertising and marketing manager—stated that it “is a big win for us, and we’re really happy with that.”
Brown spoke with Alex Luft, the executive editor of GM Authority, about the modifications that allowed Chevy to offer the new Z71 trims with a diesel engine. Along with improved packaging, cooling, and front end design, the modifications also feature a reworked skid plate that makes more space for the cooling system of the new diesel engine.
The new 3.0L I6 LZ0 diesel engine is rated at 305 horsepower and 495 pound-feet of torque, as contrasted the 277 horsepower and 460 pound-feet of torque produced by the LM2. New fuel injectors, a retuned turbo compressor, and steel pistons are highlights. Attached to the GM 10-speed automatic gearbox is the LZ0. Notably, the new Tahoe Z71 diesel and Suburban Z71 diesel won’t be accessible till the 2025 calendar year, although the 2025 Chevy Tahoe and 2025 Chevy Suburban are anticipated to go into production in November of 2024.